In a recent development, Dacheng Construction Group of Japan, in collaboration with Yokogawa, Nagano Japan Wireless Co., Ltd., and the University of Tokyo, has introduced an advanced building structure monitoring system. This innovative solution combines newly developed high-precision MEMS (Micro Electro Mechanical Systems) sensors with wireless technology operating in the 920 MHz band. The system enables long-term monitoring of structural stability, offering a reliable way to track changes over time.
*Building structure monitoring system developed this time (Source: Japan Dacheng Construction Group)*
With Japan facing increasing challenges due to aging infrastructure, including bridges and buildings, efforts have been made to address these issues through partnerships between industry, academia, and government. This system was developed under the NEDO (Japan New Energy and Industrial Technology Development Organization) project, which focuses on infrastructure maintenance and renewal.
The new MEMS sensors used in the system offer remarkable precision. The vibration sensor provides a resolution of 1 mgal (with 1 gal equaling 1 cm/s²), while the strain sensor achieves a resolution of 1 nm. These features allow for accurate detection of even the smallest deformations and vibrations over extended periods.
Data from the MEMS sensors is transmitted wirelessly in the 920 MHz band, making it less affected by internal structures like walls and ceilings. The data is collected by a receiving device installed on each floor and sent to a diagnostic computer. This approach significantly reduces the need for extensive wiring during installation.
To support installations where power is unavailable, an independent power supply unit is currently being developed. On the diagnostic side, the system uses a specialized software called "T-ia lert Structure" to analyze key parameters such as natural frequency, distortion, and tilt angle. This allows for continuous long-term monitoring of the building's condition.
In the event of an earthquake of magnitude 3 or higher, the system automatically performs a sound diagnosis based on the vibrations detected. If any abnormal conditions are identified, it can also help pinpoint potential secondary damage areas.
Dacheng Construction Group plans to apply this system in existing buildings and civil engineering structures starting in 2018. By 2019, they aim to fully implement the system, using the insights gained to develop effective Business Continuity Plans (BCPs). This marks a significant step forward in ensuring the safety and resilience of Japan’s aging infrastructure.
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